hinzke



A. G. HINZKE.

BLEACHING APPARATUS.

APPLICATION FILED APR. 14. 1916. RENEWED MAR. 12, 1919.

1,303,315. Patented May13,1919.

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ALBERT GUSTAV HINZKE, onTononTo, onTAnIo, CANADA, Assrenofa, BY MESNE ASSIGNMENTS, To AINWELL sermon McInTYnn, on NEW YORK, N. Y.

BLEAGHING APPARATUS.

Specification of Letters Patent.

Patented May 13, 1919.

Application filed April 14, 1916, Serial No. 91,023. Renewed March 12, 1919. Serial No. 282,192.

To all whom it may concern:

Be it known that I, ALBERT GUsTAv HINzKE, a citizen of the United States, residing in Toronto, Ontario, Canada, have invented certain new and useful Improvements in Bleaching Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates in general to the art of bleaching and more particularly to a method and an apparatus especially adapted for use in bleaching wood fiber preliminary to the manufacture of paper therefrom. It is customary in bleaching wood for this purpose, to use the chlorin process and to perform the operations upon the wood pulp in a vat. The present invention seeks to simplify the method of treatment of the wood fiber by the provision of an apparatus of novel construction in which the various steps can be more rapidly performed.

One of the principal means whereby the above object may be attained is an agitator composed of pipes disposedi-n such a manner that a combined vertical and radial displacement is imparted to the pulp during the bleaching operation. Other means contributing to the attainment of the object include a novel arrangement of supply and drain connections with their associated controlling valves.

These, as well as other features of the invention, will appear more clearly from a description of one embodiment thereof.

In the drawings, in which such an embodiment is shown-- Figure 1 is a side elevation of the appa- 1 ratus;

Fig. 2 is a plan view thereof with the cover and other parts above the tank removed to Show the construction of the agitators within the tank; and i i Fig. 3 is a view partly in section along the line 33 of Fig. 2.

Referring to the drawings, in which similar reference characters denote similar parts throughout the several views thereof, 12 represents a base of any desired construction, upon which the apparatus is mounted.

porting another part 0 the apparatus. A

circular tank 14; is mounted upon the base and a gasketlo provides a tight joint between the tank and the base, which is necessary because the bottom plate 16 of the tank is perforated, and liquid is therefore collected upon the top of the base and drained off, as will hereinafter be explained.

The tank is provided with a cover 17, upon which is mounted a bearing 18 for a shaft 19 extending within the tank. Upon the upper end of the shaft is a beveled gear 20meshing with a pinion 21 on a shaft 22 driven fromany suitable source of power.

Mounted upon the shaft 19, in any convenient manner, are three sets of radial arms 23. While in the embodiment illustrated herein, each set is composed of four arms placed at right angles about the shaft, it will be understood that the number of arms need not be thus limited. The arms serve as supports for a series of inclined pipes 24 constituting therewith an agitator.

In the form shown herein, each agitator pipe is bent in the form ofan approximate semicircle, and the pipes are disposed upon the arms in such a manner that one end of each pipe is near thetop of the tank while the other end is near the bottom thereof. Also, one end of each pipe is at a greater radial distance from shaft 19 than the other end ofthe pipe. The pipes are attached to the arms 23by means of clamps 25, having straps" passing over the pipes, but other modes of attachment can be used.

Upon pedestal 13 adjacent the bottom of the tank is placed a centrifugal pump 30, represented diagrammatically on the drawings. Adjacent thispump is a 3-way valve 31 from which a pipe 32 leads to a tank for storing the pulp. As the storage tank may be of any well known construction, it is not illustrated. 1

A connector 33 leads from the valve to the interior of the tank at the bottom there of. A third connector 34: leadsto the pump from which there is a vertical pipe 35, leading to" a second 3-way Valve 36 above the top the tank. V

. Through a channel in the base is a pipe 39 leading from a junction 40, and having added vmay be easily determined.

upon its end a distributing head 41, the upper edge of which is approximately flush with the top of the base, as appears in Figs. 1 and 3. The bottom of thedistributing head also opens into the channel to drain liquid therefrom during the use of the apparatus.

From the junction 40, a pipe 42, having a valve 43 therein, leads to a source of steam supply. A second pipe 44, having a valve 45, leads to a source of air supply. There is also a third pipe 46,- vvith a valve 47, which serves as a drain pipe.

Passing through the cover of the tank is a pipe 48 leading to the reservoir containing the chlorin or other bleaching agent. This pipe is provided with a valve 49. The pipe 50 leads to a water supply, the flow of which may be controlled by the valve 51.

The method of bleaching by this apparatus' is asfollows:

The agitator is first set in motion, after which the 3-way valve 31 is turned so that the pipe 32 leadingto the pulp storage tank is in connection with the pipe 35. The 3- way valve 36 is set so as to provide communication between the pipes 35 and 38. The pump 30 is now set in operation and causes the pulp to be lifted through the pipe 35 and discharged into the tank through pipe 38. When the tank is filled, the supply of pulp is stopped by manipulation of the valves 31 and 36. As the pulp in this condition contains too much water, it must be drained until of the required density. This operation is performed by opening the valve '47 of the drain pipe 46, thus allowing the water to drain by gravity through the perforated base of the tank and through the pipe 39.

' When a suflicient amount of water has been removed, drain valve 47 is closed. The valve 43 to steam pipe 42 is then opened and steam is admitted long enough to heat the fiber mass to about 110 F. The steam-supply is then cut off and the chlorin liquor added to the mass by opening the valve 49 in the chlorin pipe 48. It will be an advantage in the practice of the invention to keep the chlorin or other bleaching agent in a measuring tank so that the quantity to fie T e chlorin bleaching liquor should be about 5 I Beaum. After a suflicient amount of the bleachingliquor has been added, the supply thereof is cut off, and the valve 45-is opened and air is allowedto penetrate the fiber mass without driving out any of the chlorin gas. 'Chlorin gas has a great affinity for oxygen and is most effective as a bleaching agentat about 110F. Hence the use of air and a temperature of 110 F.

"During the bleaching operationthe agitator will be rotating and thesmall arrows in Fig.2 indicatethe direction oftravel of portions of the mass into and out of the pipes as the agitator is rotated in the direction of the long arrow outside of the tank. In each case portions of the mass near the bottom thereof will be forced into the lower ends of the agitator pipes, as indicated by the arrows pointing into the ends of these pipes. The motion of the pipes through the mass will cause the portions that enter the same to be conveyed through them and discharged from the upper ends thereof, as indicated by the arrows pointing out of the ends of the pipes. At the same time that portions of the mass are being displaced vertically they will also be displaced toward 0i from the center of the tank, since two of the pipes take in material near the outer edge of the bottom tank and discharge it at the top of the tank midway between the center and outer edge thereof, while the other two pipes take in material at the bottom midway between the center and outer edge thereof and discharge it at the top near the outer edge. The apparatus thus insures a continuous and thorough agitation of material within the tank by causing actual or positive vertical radial and rotary displacements of all portions of the mass.

When the operation has been carried on until the pulp has been bleached to the desired degree, the air valve 45 is closed. and the drain valve 47 and the water supply valve 51 are opened. Water is run through the mass until it has been sufiiciently washed and cooled, after which these two valves are closed.

Then the 3-way valve 36 is manipulated to place pipe 35 in communication with pipe 37 leading to the storage tank for the bleached pulp. The 3-way valve 31 is also set so that the pulp may be drawn from the tank through the connector 33, and by means of the pump 30 forced through the pipe 35 to the storage tank. The pump should be operated until the tank is emptied, after which it is ready for another operation.

It will be seen from the above description that there is provided a simple and eflicient method of bleaching pulp or any other substance by means of a novel apparatus in which the various steps of the process can be carried out in a convenient manner, and with the minimum expenditure of energy. The novel construction of the agitating device in the tank provides a means for thoroughly mixing the pulp and the bleaching liquor, While at the same time the construction is simple, has but few moving parts, and is not liable to get out of order.

Another important feature of the invention is the location of the steam and air inlets and the drain outlet centrally under the perforated bottom of the tank. By this disposition of the parts, an even distribution of steam and air into the fiber mass is obtained, and the process of Washing and draining the fiber is shortened and simplifled.

Various modifications or changes in the details of the construction of my invention may be made Without limiting the scope of the same, or departing from the principle thereof.

Having described my invention, What I claim as new anddesire to secure by Letters Patent is 1. A bleaching apparatus comprising, in combination, a base, a tank mounted upon said base, a perforated bottom for said tank spaced above said base to form a chamber between said bottom and said base, means associated with said base and communicating with said chamber for admitting gases to said tank and for draining liquids therefrom, a shaft within said tank having its lower end supported on said bottom, a plurality of supports upon the shaft and a plurality of inclined tubular members mounted on said supports with their ends disposed on opposite sides of said shaft; substantially as described.

2. A bleaching apparatus comprising, in combination, a tank, a shaft Within said tank, a plurality of supports attached to the shaft and a plurality of inclined tubular members mounted upon said supports and so disposed with respect to said shaft that their ends are on opposite sides of said shaft; substantially as described.

3. A bleaching a paratus comprising, in combination, a tank a shaft within said tank, a plurality of supports upon the shaft and a plurality of inclined curved tubular members mounted upon said supports, some of said members having their. upper ends near the Wall of the tank and their lower ends on the opposite side of the shaft and others of said members having their lower ends near the Wall of the tank and their upper ends on opposite sides of the shaft; substantially as described.

4. A bleaching apparatus comprising, in combination, a tank, a shaft Within said tank, a plurality of supports attached to the shaft and a plurality of inclined semi-circular tubular members mounted upon said supports With their upper ends near the wall of the tank and their corresponding lower ends on the opposite side of and nearer to the shaft, and similar members mounted on the supports with their lower ends near the Wall of the tank and their corresponding upper ends on opposite sides of and nearer to the shaft; substantially as described.

In testimony whereof I affix my signature.

ALBERT GUSTAV HINZKE.

fiopiea of this patent may be obtained for five cent: each, by addressing the "commissioner of Patent.

Washington, D. 0. 

